Step 1: Test a Point
Take a point inside the shaded region, for example $(3,1)$.
Step 2: Evaluate Each Line
$x+2y-2=3\gt0$, $3x+5y-15=-1\lt0$, $2x-3y+6=9\gt0$.
Step 3: Compare the Options
The signs are $\geq,\ \leq,\ \geq$ for the three lines, which is only option (D).
Final Answer:
Only option (D) has the correct inequality signs.
\[ \boxed{\text{(D) }x+2y-2\geq 0,\ 3x+5y-15\leq 0,\ 2x-3y+6\geq 0,\ x\geq 0,\ y\geq 0} \]